shishi_realm_for_server_dns - API function

       Shishi * handle
                   Shishi library handle created by shishi_init().

       char * server
                   Hostname to find realm for.

       Copyright © 2002-2022 Simon Josefsson.
       Copying and distribution of this file, with or without modification, are permitted in any medium  without
       royalty provided the copyright notice and this notice are preserved.

       Finds    the    realm    for    a    host    server    using    DNS   lookup,   as   is   prescribed   in
       "draft-ietf-krb-wg-krb-dns-locate-03.txt".

       Since DNS lookup can be spoofed, relying on the realm information may result in a redirection attack.  In
       a single-realm scenario, this only achieves a denial of service, but with trust  across  multiple  realms
       the attack may redirect you to a compromised realm.  For this reason, Shishi prints a warning, suggesting
       that the user should instead add a proper 'server-realm' configuration token.

       To illustrate the DNS information used, here is an extract from a zone file for the domain ASDF.COM:

       _kerberos.asdf.com.               IN     TXT       "ASDF.COM"  _kerberos.mrkserver.asdf.com.    IN    TXT
       "MARKETING.ASDF.COM" _kerberos.salesserver.asdf.com. IN   TXT     "SALES.ASDF.COM"

       Let us suppose that in this case, a client wishes to use a service on the host "foo.asdf.com".  It  would
       first query for

       _kerberos.foo.asdf.com.  IN TXT

       Finding no match, it would then query for

       _kerberos.asdf.com.      IN TXT

       With the resource records stated above, the latter query returns a positive answer.

       shishi_realm_for_server_dns - API function

       Report  bugs  to <bug-shishi@gnu.org>.  GNU Shishi home page: http://www.gnu.org/software/shishi/ General
       help using GNU software: http://www.gnu.org/gethelp/

       Returns realm for the indicated host, or NULL if no relevant TXT record could be found.

       The full documentation for shishi is maintained as a Texinfo manual.  If the info and shishi programs are
       properly installed at your site, the command

              infoshishi

       should give you access to the complete manual.

shishi                                                1.0.3                       shishi_realm_for_server_dns(3)

#include<shishi.h>char*shishi_realm_for_server_dns(Shishi*handle,char*server);